Question
How can I create a new X in a window of the old X? A custom .xinitrc for the new X would be nice. I intend to use this for WM tinkering, so I don't break the WM I'm currently running.
Solution
Use Xnest.
Use Xephyr. It's an X server whose backend is an X window.
Recommendation taken from packages.debian.org:
Use of the Xephyr X server instead of Xnest is recommended.
— https://packages.debian.org/wheezy/xnest
Xephyr is an X server that can be run inside another X server, much like Xnest. It is based on the kdrive X server, and as a result it supports newer extensions than Xnest, including render and composite.
OTHER TIPS
You could run a virtual machine using VirtualBox.
The nice thing about that is you can modify pretty much anything and everything. If you work yourself into a hole, no problem; just revert to a snapshot or reinstall the virtual machine.
https://stackoverflow.com/questions/13924914
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